Influence of a magnetic field on the antiferromagnetic order in U<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pt</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Lussier, Benoit; Taillefer, Louis; Buyers, W. J. L.; Mason, T.E.; Petersen, Thorben

doi:10.1103/physrevb.54.r6873

Cited by 29 publications

(40 citation statements)

References 38 publications

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“…An eventual field effect on a F and a S could be confirmed only by measurements with the electrostatic kicker device at all fields. Since highfield neutron diffraction [13,14] did not detect any sizable change in the relative population of the three equivalent antiferromagnetic domains, we do not expect a field effect on the initial asymmetries.…”

Section: (Received 5 May 1999)mentioning

confidence: 99%

“…A rotation of these moments induced by the applied field leads to an additional field at the muon site. A small rotation is not excluded by neutron diffraction since this technique gives an upper bound rotation angle as large as 26 ± [13]. But it is surprising for a magnet with moments oriented along the a ‫ء‬ direction to observe the same K m for B ext k a and B ext k a ‫ء‬ (see Fig.…”

Section: (Received 5 May 1999)mentioning

confidence: 99%

“…A change of the magnitude of the moments is excluded since high-field neutron diffraction measurements do not detect any sizable influence of a field up to 12 T [13,14]. Two mechanisms producing an additional shift can be imagined.…”

Section: (Received 5 May 1999)mentioning

confidence: 99%

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Evidence for a Two Component Magnetic Response inUPt3

Yaouanc

Réotier

Gygax³

et al. 2000

Phys. Rev. Lett.

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Evidence for a two component magnetic response in UPt3Yaouanc, A.; de Reotier, P.D.; Gygax, F.N.; Schenck, A.; Amato, A.; Baines, C.; Gubbens, P.C.M.; Kaiser, C.T.; de Visser, A.; Keizer, R.J.; Huxley, A.; Menovsky, A.A. Published in:Physical Review Letters DOI:10.1103/PhysRevLett.84.2702 Link to publication Citation for published version (APA):Yaouanc, A., de Reotier, P. D., Gygax, F. N., Schenck, A., Amato, A., Baines, C., ... Menovsky, A. A. (2000). Evidence for a two component magnetic response in UPt3. Physical Review Letters, 84, 2702-2705. DOI: 10.1103/PhysRevLett.84.2702 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.Download date: 08 May 2018 VOLUME 84, NUMBER 12 Evidence for a Two Component Magnetic Response in UPt 3A. Yaouanc, 1 P. The magnetic response of the heavy fermion superconductor UPt 3 has been investigated on a microscopic scale by muon Knight shift studies. Two distinct and isotropic Knight shifts have been found for the field in the basal plane. While the volume fractions associated with the two Knight shifts are approximately equal at low and high temperatures, they show a dramatic and opposite temperature dependence around T N . Our results are independent on the precise muon localization site. We conclude that UPt 3 is characterized by a two component magnetic response. The hexagonal heavy fermion superconductor UPt 3 is attracting much interest because it has been established as an unconventional superconductor as seen by the existence of three distinct superconducting phases in the magnetic field-temperature plane [1,2]. In zero field the two superconducting phase transitions occur at ϳ0.475 K and ϳ0.520 K. It is usually thought that this complex phase diagram arises from the lifting of the degeneracy of a multicomponent superconducting order parameter.The most popular candidate for such a symmetrybreaking field is the short range antiferromagnetic order characterized by a Néel temperature of T N Ӎ 6 K and an extremely small ordered magnetic moment [0.02 ͑1͒ m B ͞U-atom in the limit T ! 0 K] oriented along the a ‫ء‬ axis (ϵ b axis). The magnetic order has been observed only by neutron [3] and magnetic x-ray [4] diffractions.Nuclear magnetic resonance [5] and zero-field muon spin relaxation [6] measurements as well as macroscopic studie...

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Section: (Received 5 May 1999)mentioning

confidence: 99%

Section: (Received 5 May 1999)mentioning

confidence: 99%

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Evidence for a Two Component Magnetic Response inUPt3

Yaouanc

Réotier

Gygax³

et al. 2000

Phys. Rev. Lett.

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“…Larger expected ratios between the low-and high-field intensities are obtained with the experimental setup used by Lussier et al 25 They measured the neutron scattering cross-section at three different momentum transfers, all 25 report data for Q 1 and Q 2 , and magnetic fields up to 3.5T . We can estimate from Eq.…”

mentioning

confidence: 99%

“…domain "1" for Q 1 ) then, Figure 3 displays the experimental data of Ref. 25, and theoretical calculations for two samples, one with domains "1" and "2" equally populated at zero field, another with domains "1" and "2" unequally populated.…”

mentioning

confidence: 99%

Magnetic field effects on neutron diffraction in the antiferromagnetic phase ofUPt3

Moreno

Sauls

2000

Phys. Rev. B

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We discuss possible magnetic structures in UPt3 based on our analysis of elastic neutronscattering experiments in high magnetic fields at temperatures T < TN . The existing experimental data can be explained by a single-q antiferromagnetic structure with three independent domains. For modest in-plane spin-orbit interactions, the Zeeman coupling between the antiferromagnetic order parameter and the magnetic field induces a rotation of the magnetic moments, but not an adjustment of the propagation vector of the magnetic order. A triple-q magnetic structure is also consistent with neutron experiments, but in general leads to a non-uniform magnetization in the crystal. New experiments could decide between these structures.Pacs numbers:74.70. Tx,75.20.Hr,75.25.+z The coexistence of antiferromagnetic and superconducting order for five of the six heavy fermion superconductors suggests a deep connection between these two aspects of heavy fermion physics. In these materials the f-electrons are involved in the superconducting transition, just as they are in the formation of the coherent heavy fermion band, but their precise role in the development of the unconventional superconducting phase is still unclear.The magnetic field versus temperature phase diagram of U P t 3 provided compelling evidence of unconventional superconductivity in U-based heavy fermion materials.1-3 In order to explain the phase diagram of UPt 3 several authors proposed a multicomponent order parameter based on a multi-dimensional representation of the hexagonal point group.4-8 In these models a weak symmetry breaking field (SBF) is invoked. This SBF lifts the degeneracy of the multi-dimensional representation and leads to multiple transitions at lower temperatures and higher fields (see also the reviews in Ref. 9).A natural candidate for the role of SBF is the weak antiferromagnetic order shown by neutron scattering measurements below T N = 6K.10-12 The ordered moment is unusually small, only 0.02µ B per U atom, and is directed in the basal plane, thus breaking the in-plane hexagonal symmetry. Evidence in support of an antiferromagnetic SBF coupled to the the superconducting order parameter is based on the correlation between changes in the magnitude of the ordered moment and the splitting of the double transition. Both the splitting and the AFM order parameter are suppressed under applied pressure of p c ≈ 3.5 kbar.13,14 The effect of P d is the opposite; the splitting and the ordered moment increase with increasing P d substitution. 15Most thermodynamic and transport measurements have failed to detect a signature of AFM ordering near T N ≃ 6 K. [16][17][18][19] However, evidence of magnetic ordering is observed to onset at T N in the magnetoresistance. 20The transition has other unusual characteristics as well, including finite range correlations, ξ AF M ∼ 300 − 500Å, depending on the crystalline direction and sample. By contrast , (U, T h)(P d, P t) 3 alloys exhibit AFM ordering at T N ≈ 6 K, but with ordered moments of conventional size, µ ∼ ...

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Space-group approach to the nodal structure of superconducting order parameter in ferromagnetic and antiferromagnetic materials

Yarzhemsky

2000

Int. J. Quantum Chem.

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Influence of a magnetic field on the antiferromagnetic order in UPt3

Cited by 29 publications

References 38 publications

Evidence for a Two Component Magnetic Response inUPt3

Evidence for a Two Component Magnetic Response inUPt3

Magnetic field effects on neutron diffraction in the antiferromagnetic phase ofUPt3

Space-group approach to the nodal structure of superconducting order parameter in ferromagnetic and antiferromagnetic materials

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